Can i change the oil pump on a 1999 dodge ram 2500 v10 without having to lift engine not sure if there is enough room get pan off or not?

It's highly unlikely you can replace the oil pump on a 1999 Dodge Ram 2500 V10 without at least partially lifting the engine. While some vehicles offer enough clearance to drop the oil pan without engine movement, the V10's size and the oil pump's location make this extremely difficult, if not impossible. The oil pan itself is often quite large and cumbersome, and removing it without sufficient clearance to maneuver it past various components (like the steering linkage, exhaust manifolds, and possibly the front crossmember) is going to be a major challenge.

You will almost certainly need to:

* At least partially lift the engine: This provides the crucial clearance needed to remove the oil pan. Even a modest lift, perhaps a few inches, can make a significant difference.

* Possibly remove other components: Depending on the access needed, you might also have to remove parts of the front suspension or exhaust system for better maneuvering room.

Attempting the job without engine lift or at least significant tilting is likely to cause damage to surrounding parts, increase the difficulty exponentially, and extend the repair time considerably. A properly supported engine lift is essential for a safe and efficient repair. The risk of damaging the engine or other components far outweighs any potential time savings from trying to avoid lifting.